Preprints
https://doi.org/10.5194/amt-2021-370
https://doi.org/10.5194/amt-2021-370

  15 Dec 2021

15 Dec 2021

Review status: this preprint is currently under review for the journal AMT.

The MOPITT Version 9 CO Product: Sampling Enhancements and Validation

Merritt Deeter1, Gene Francis1, John Gille1, Debbie Mao1, Sara Martínez-Alonso1, Helen Worden1, Dan Ziskin1, James Drummond2,3, Roísín Commane4, Glenn Diskin5, and Kathryn McKain6,7 Merritt Deeter et al.
  • 1Atmospheric Chemistry Observations and Modeling Laboratory, National Center for Atmospheric Research, Boulder, CO, USA
  • 2Department of Physics, University of Toronto, Toronto, Ontario, Canada
  • 3Department of Physics and Atmospheric Science, Dalhousie University, Halifax, Nova Scotia, Canada
  • 4Department of Earth & Environmental Sciences, Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, USA
  • 5Langley Research Center, NASA, Hampton, VA, USA
  • 6Global Monitoring Laboratory, National Oceanic and Atmospheric Administration, Boulder, CO, USA
  • 7Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA

Abstract. Characteristics of the Version 9 (V9) MOPITT ("Measurements of Pollution in the Troposphere") satellite retrieval product for tropospheric carbon monoxide (CO) are described. The new V9 product includes many CO retrievals over land which, in previous MOPITT product versions, would have been discarded by the cloud detection algorithm. Globally, the number of daytime MOPITT retrievals over land has increased by 30–40 % relative to the Version 8 product, although the increase in retrieval coverage exhibits significant geographical variability. Areas benefiting from the improved cloud detection performance include (but are not limited to) source regions often characterized by high aerosol concentrations. The V9 MOPITT product also incorporates a modified calibration strategy for the MOPITT near-infrared (NIR) CO channels, resulting in greater temporal consistency for the NIR-only and thermal infrared-near infrared (TIR-NIR) retrieval variants. Validation results based on in-situ CO profiles acquired from aircraft in a variety of contexts indicate that retrieval biases for V9 are typically within the range of ±5 % and are generally comparable to results for the V8 product.

Merritt Deeter et al.

Status: open (until 23 Jan 2022)

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  • RC1: 'Comment on amt-2021-370', Anonymous Referee #1, 23 Dec 2021 reply

Merritt Deeter et al.

Merritt Deeter et al.

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Short summary
The MOPITT (“Measurements of Pollution in the Troposphere”) satellite instrument uses remote sensing to obtain retrievals (measurements) of carbon monoxide (CO) in the atmosphere. This manuscript describes the latest MOPITT data product, Version 9. Globally, the number of daytime MOPITT retrievals over land has increased by 30–40 % compared to the previous product. The reported improvements in the MOPITT product should benefit a wide variety of applications including studies of pollution sources.